I would just like to post here to further confirm the weird clicking. I bought my Macbook Air 13" a couple of weeks ago, and notice a clicking coming from the casing when even the slightest pressure is applied to the keyboard surface of the laptop. However, I cannot reproduce it 100% of the time. When it does happen, I can feel the faint vibration as well in my wrists.
Leaning on the laptop edges to type typically produces the sound, and it comes from both the bottom right and bottom left corners. It's mildly annoying, obviously doesn't affect how the computer performs, but kind of discouraging for a £1200 spend.
I bought AppleCare with it, my only concern is that if I take it back, the Apple genius I talk to will no be able to reproduce, or acknowledge the sound in the busy/loud store.
Does anyone have any advice? Should I just take it in?